The prototype for Microsoft's Kinect camera and microphone famously cost $30,000. At midnight Thursday morning, you'll be able to buy it for $150 as an Xbox 360 peripheral. Let's take some time to think about how it all works.

Nintendo's president Satoru Iwata was more mouthy than most presidents are about their upcoming, but unannounced, products, and said that the upcoming DS will have an accelerometer. Or, some kind of motion sensor.